My portfolio consists of BTC,ETH,XRP,SOL,DOT,XLM,ADA
Your choices and options are too many to me, it increases the risk you will face and makes it so that if you are not careful, you will just be consistently loosing the capital you want to invest, and then you will not be able to meet your target of getting a house.
If you must invest in Altcoins, invest in a few (One or two), it reduces the risk and make your investment easier to monitor.
I'll slash it into few like BTC, ETH.
That shall do and will be able to hit his target for having the cost of owning an apartment. It's a good plan of having the profit go into another asset that will generate income.
Not a lot of investors able to do that because they don't know how to spend their profit when it's already on hand.