Financial situation:
I’m in my late 30s. Debt free. Living for free in one of my parents 3 properties. 2 years from now I will inherit 50% of a house. The other 50% is for my sister and I am saving money to pay her part, so the house is fully mine.
70k euros in the bank, saved as deposits.
20k invested in crypto last year, now worth 45k euros. This is 0.25 bitcoin, 3500 XRP bought at 50 cents (currently 4x) 30 000 HBAR bought at 6 cents (currently 5x), and about 3000 euros in smaller positions.
Doesn't sound to me that you have funds to manage. :/
I assume you have no assets other than a personal vehicle? Right now you have nothing. In two years, you may have 50% of nothing - your sister can be manipulated outside of your control, and I have seen many families torn apart in times like this.
Do not go making any other investment until you secure the most important investment - your residence. Sounds like your sister is willing to sell to you, but obviously she wants to wait to see how much the house will be worth - if you have set a price that's even better! You should contact a lawyer and create a sale contract while she still wants to sell. You don't need to set a sales price, it can be calculated later at market value. Then you pay your sister all your excess money that you can afford as a down payment and get the house 100% in your name. Your living arrangements don't need to change.
The point I am making is in two years when the shit could have hit the fan - you have the deed instead of a lawyer or trustee. And your sister, who didn't want the house, will have invested in something she does want. Plus, your savings can be spread between the two of you.
Good luck!