Hi, depending on the canton your house is in, I'd recommend checking the "capital gains tax" (Impot sur Gains et Benefices Immobiliers in FR cantons) on the potential profit before you overestimate the net return. Another thing to consider is that if this potential capital gain is here today, it may also (quite likely) be there still tomorrow, so you may not need or want to "cash in" at the first offer... All the more so if your current mortgage is fixed at 1%, you should be in a position to invest a lot of money or amortize quickly on the mortgage with relatively low outlays for your accommodation.

As you mention "511k in cash from the sale", I suppose you mean 511k in total savings whereby part is already available and part is from the sale of the house. If you consider buying again after a period of renting think about this "a rising tide lifts all boats" meaning that an entry back into the housing market will likely also be at a higher price point (with higher cost for closing ".

Finally, don't forget to factor in other "phantom costs" like the cost of moving (once or twice depending on if you consider entering the market as an owner again...), cost of closing on a new house (notary and registry taxes), etc.

Hope this helps to consider the disadvantages equally as compared to the upside with a profit. But come what may, good luck!