The problem in the first instance will be, what countries can you get into, apart from perhaps the EU in your case. At the moment, it's simply too early to project: the vast part of the world remains off-limits. But based on current warmish open places, maybe the Sinai, maybe Antalya, maybe Oaxaca or someplace else in Mexico. Rumours that Bali will try to re-open as early as possible, so keep your eye there. But staying for several months is an immigration hassle.
The immigration question is a good one. I imagine many will have exceeded visa stays due to being stranded and unable to get a flight out. I would like to think that authorities haven't been too harsh in that regard but I would look to ensure that I don't get caught out over winter by ensuring any visa length is at least 90 days.