I would do some redecorating, but don't over extend your funds. He is living on his own, and I seriously would not expect him to shoulder all of the costs and expenses for the redecorating. If you watch the sales, you can find paint periodically on sale at a fairly reasonable price. You can switch up your furniture, i.e, move it around or place the pieces in a different room, etc. Do some treasure hunting at the local yard sales or thrift stores...I have found some amazing pieces and then I either repainted or recovered the items. Try to think outside the box.
Just my two cents...I wouldn't expect him to pay for any changes in your home unless it is a major repairs.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.