Thanks for sharing and wish you guys success for your goals. I mean it dearly because someone close to me has similar goals. You made a post here too. Hope you read the answers.

When someone comes on the forum with such an honest goal putting in hard-earned money, it is always tricky as to what advise one should give. Hence, if you are only going by advice, nobody in their right minds would suggest anything other than BTC. As everyone already explained, this market lives and moves with BTC. The moment you open yourself up to Alt-coins, it can quickly turn into a goose-chase many don't recover from. There is a whole industry of influencers and shills out there trying to convince that everyone can make a 100X. (which is simply not possible).

Hence, if retirement is your goal and you have time, another way is to get into earning crypto by utilizing your existing skills. Once you start earning, that gives you slightly more freedom to experiment and take the risk to "diversify". This will need time and focus of course but it is possible. Like everyone else, I would of course advise against any diversification into Alts with actual fiat savings.

If you want more discussion on this, feel free to ask in PM.