God gave the Sabbath to Israel so that all rich and poor, male and female, could rest from daily toil. But rest after work is quite a different thing from being idle. The way to find proper enjoyment is through wholesome activities. Some people may choose to get involved in home improvement and repairs. One retiree told me he is glad whenever his wife tells him about a leaky faucet or something that needs fixing.
Some people choose a hobby.
Others find great delight in golfing or fishing or watching sporting events. Many hobbies are available even for people who are confined to their homes. Find something you can enjoy and spend some time doing it. The third essential element in handling the time afforded by retirement is that of reaching out to others. For Christians this can be an effective way to witness.