In general, and with rare exceptions, the returns in love situations are roughly proportional to the amount of time and devotion invested. The amount of love you get from an investment in love is correlated, if only roughly, to the amount of yourself you invest in the relationship.
If you invest caring, patience and unselfishness, you get those things back. (This assumes, of course, that you are having a relationship with someone who loves you, and not a one-sided love affair with someone who isn’t interested.)
Realistic expectations are everything. If you have unrealistic expectations, they will rarely be met. If you think that you can go from nowhere to having someone wonderful in love with you, you are probably wrong. You need expectations that match reality before you can make some progress. There may be exceptions, but they are rare.
Ben Franklin summed it up well. In times of stress, the three best things
to have are an old dog, an old wife and ready money.