pup8617
I've held off tossing my two cents worth in because we've been without Internet all day. But there's no sign of it returning, so I'll try pounding this out on my phone. If I fail, at least you'll never know.
The pandemic has totally screwed higher education up in Brazil, but many public universities (federal and state, in states that have their own) offer Portuguese classes for foreigners. You definitely should contact the universities, and sign up for one if you can. Talking to Brazilians is essential, of course, but that can only take you so far. There are important things that only formal education can help you with.
Golsucks has recommended Duolingo. I've gone over Duolingo in detail, and second that. It won't teach you everything you need to know, it can drive you crazy by not explaining things, and it has some strange turns of phrase, but it will speed up your learning. It's also given by native speakers using neutral accents, which is good experience for a beginner.
There are several good sites you can use for quick checks on verb conjugations. I still need to check a verb on occasion, and this is one that I find helpful:
https://www.conjugacao.com.br
For a good online dictionary, I don't think you can't beat Michaëlis Moderno:
https://michaelis.uol.com.br
In addition to English-Portuguese, the same site has a Brazilian School dictionary that gives word derivations, and bilingual dictionaries (with Portuguese, of course) for French, Italian, German, and Spanish, if you need to cross-check a word against any of those languages.
Reading newspapers is a very helpful habit that is overlooked far too often. Quality newspapers write in excellent, contemporary Portuguese, and give you the written language in a dependable form. Two of the best, Folha de S. Paulo and Estado de S. Paulo (aka "Estadão", Brazil's newspaper of record) offer inexpensive digital subscriptions. They both also have regular podcasts, very good for listening comprehension. Folha's Café da Manhã podcast, offered M-F, highlights an important story every day, and ends with a news roundup. We listen every day at breakfast.
Listening to Brazilian music - sung, of course - can be a surprisingly big help. I recommend samba, and two of the greatest artists of the 20th Century, Beth Carvalho and Clara Nunes. They both made a point of recording the work of some of the best composers on the Rio scene. The Portuguese is good, and they really push the lyrics. I can't think of a better way to get the rhythm of the language. It's a good intro to the Carioca accent, too, which you probably don't want to adopt, but need to understand.
Stevewaugh recommended getting familiar with CelpeBras. I endorse that, too, with some reservations. CelpeBras is the test given worldwide to prove competence in the Portuguese language. My estimate is that it's geared toward the level of a native speaker with a good secondary school education; only about half the people who take it (it's offered twice a year) pass. So, CelpeBras can be very useful practice for identifying areas where you need work; don't be discouraged, though, if it seems impossible, especially at first. You can get there in time.
If you want to look it over, the Federal University of Rio Grande do Sul keeps an archive of prior years' tests, that can be downloaded for practice here:
http://www.ufrgs.br/acervocelpebras/acervo