would like to buy Bitcoins at the price of 2013-14 to gain back the lost Coins.
You didn't give information about how exactly you lost your coins, but I can assume during the early days holders of Bitcoin were still adapting to safety and security and would have made a couple of mistakes leading to loss of their assets.
I was not into Bitcoin back in 2013 and I would also wish to buy Bitcoin at the price it was back then, this is obviously not possible, what is possible is buying bitcoins now and setting your holding plan, this would position you to benefit from Bitcoin in the future;
• Bitcoin is highly divisible and one can buy satoshis which are smaller units of a whole coin.
• Bitcoin's supply flow is constantly thinning due to having and as such there would be less bitcoins being pumped into circulation in 4 years than now. An increase in demand would probably lead to an increase in the price of Bitcoin
• If you set an investment strategy, with funds you can afford to put in, you can still profit. Check out this thread -
(SSS) - A Sane and Simple bitcoin Savings planA key highlight from that thread which could be helpful;
The past cannot be changed, but there are enough gains waiting for us in the future to amply reward those who care to exercise their logic and invest rationally.