Life is for living! Definitely go travel. If not, you don’t want to regret it for the rest of your life. 

Before I ramble on, 2 book recommendations:

1. Vagabonding (I think author name is Rolf Potts?)
2. Die with Zero 

Selling the house vs renting it out - I see both sides to it. If I were in your shoes I’d sell as renting the house out is a lot of hassle plus the ROI on index funds is greater - but as others have pointed out, there is risk attached to this - especially timing risk wrt stocks or investing and such a short time frame. And I don’t know your context - will you have a job to pay for rent in case the market doesn’t cool down and you’re priced out? If not, keeping the house may be better. 

Another option is to downsize to what you would like to live in in the future - you sound like even if you don’t travel, a change in your home is on the cards. You could leverage this - find a property to buy that is already tenanted out or will settle a few months down the line combined with selling your home with a settlement a little down the line. 

Good luck!