Are you skipping bitcoin? you look at altcoins and then you're wanting to have a long term goal in this market. If that is so, bitcoin is the ideal choice of yours.
It's been proven by me and the others who have held it for more than 5 years which is your goal. In the past it was quite cheaper but as time goes, you see the progress of it and there's more to its price today which shall increase in the future.
Bitcoin for me always will remains in my portfolio though I may continue to diversify the portfolio and certain percentage of allocation might change going forward, but eliminating bitcoin to me will not make sense and should always be part as it is a key component in driving the crypto market.