We registered this great domain in year-2004 making name well-aged and giving extra value. There are more than 775,000 results in Google on a "lasting success" search.
Some popular related searches are on; key to lasting success, build lasting success, creative lasting success, achieve lasting success, build for success, build lasting success website, build lasting success system, lasting success in life, keys to lasting relationships, leadership training
LastingSuccess.com is available and on-sale due to its owner retiring soon. In fact, a desire for retirement income is a reason the owner can do an interest-free monthly payment plan (and a buyer's benefit).
P.S. No worries about using the domain while paying. You will have the same use as if you paid purchase price up-front, and be able to use your own DNS immediately upon making your first payment.