I think the safest thing would be self-hosting your own solo GoToSocial instance. With SLURP you could import your entire Mastodon archive… and if you’re not proficient, coding-wise, you could install GoToSocial via YunoHost.org, which is so easy to follow, a total newbie could do it (speaking from experience). The only requirement would be a basic VPS (say, about 5 Euros a month). If you could give up 1-2 coffees a month, it’s not that big of an expense. I personally love my GtS account, as I get to personalize it, setting character limits, uploading my own custom emojis, etc.