I have been waiting for Bitcoin to reach $3000 so that I can sell my Bitcoins, but seems as if it doesn't want to reach that value anytime soon. SHould I sell with the current amount? 
The safest, and in my opinion probably the smartest decision would be sell now.
If you bought in pre-halving then you would have quadrupled your investment or even more in some cases in a short timespan of a year. So even though you missed out on the ATH as an opportunity to sell, you're still getting a decent amount now.
I'd expect pre-UASF a week or so the price will drop dramatically as a result of people panic selling. So therefore, if you're in bitcoin for the long run, then you should sell now, and buy when the price dips down pre-1 August.
I have a feeling though that we'll see another pump, hopefully breaking $3000. There has been much sideways movements the past few days, probably meaning that we're retesting 3k.
I half agree with you. If you want to be super safe while earning at least something, it is advisable for you to sell it now instead of waiting. But in the current market, there is a high potential for the price of the bitcoins to increase around next 2-3 months but also remember that this decision involves a huge amount of risk. Since the market is somehow unpredictable, always give room to the unexpected circumstance. But I strongly believe that this is the best time to buy BTCs and sell it some later time due to the prices being low.