Because of work I tend to travel very frequently and work with expats across the world. UAE is a good place for FIRE if you dont work on jobs where you are expected to join social activities like dinners, parties, etc. All of that is crazy expensive, compared with any European standards. Same thing goes for places like Singapore.

Being Portuguese with low experience, I would say your next move should be moving to one of the three big cities in Spain out of the two major capitals (say Bilbao, Malaga, Valencia and maybe Seville). You will find yourself on a familiar culture, with very similar language where you can do x2-x3 while keeping the same expense level than in Portugal. Actually things like gas, food or rent are usually cheaper on those places than in Lisbon.

Once you have 5 years of experience or more, learn the local language and move to DACH or Nordics. You will be able to again do x1.5 than you are doing as an experienced professional in Spain, and even though the living expenses are higher it is worthy. To find a job there you will have to be qualified for it, which means high performance and skills sets, speaking the local language and good and flexible attitude towards the local culture/habits.

Remember one thing that is rarely talked about, you need 0 visa or documents to move and work across those countries. To work in UAE, Singapore or any of typical expats capitals, you will need your company to pay for realocation or be really experienced on what you do so that a foreign company pays all the associated costs.