i plan to invest $100 weekly for 5 years ($26,000 total) to average market entry.
Op I think you are getting yourself confused,
Weekly investment you said : $100
Total for a month investment: $100× 4weeks = $400
And I think your yearly should be : $400 × 12 months = $4,800
In your previous calculations it seems you had an error, just like you said investing $100 per week would indeed result to a yearly investment of $4,800 and not 26,000 so take corrections of that.
It seems that in this case you are a little mistaken my friend

what Mr. Reporter said is quite reasonable because indeed when he tries to make purchases of around $100 / week then with the calculation per year whose standard is currently 52 weeks (although in some years there are 53 weeks) then it will generate $5200 / year, If in the end 5 years is the target that wants to be done for purchases then it is definitely around $26k for 5 years (260 weeks) of consistent purchases of $100 per week with a calculation of $100x260= $26k weeks.
Patient and consistency is just the primary thing for an investor in Bitcoin. I don't actually allow the downtrend of the markets to be a major concern for me so that I don't get distracted, because sometimes the fluctuation of the markets can be very discouraging especially for a newbie, instead of monitoring the markets price of Bitcoin,I prefer to channel my energy and focus promptly on my accumulation pace,thereby gradually increasing my rates of buying bitcoin weekly and consistently without overstepping my financial limits. its certain that Bitcoin will continues to grows in value overtime and tha t'why s it's not all considerable to be focusing our attention on the current price, because it will surely grows beyond that value but instead,stashing more coins into our portfolio should be our major concern and primary focus and while patiently Hodling for the long term.
Sometimes in some moments precisely when the market trend is down is a good enough opportunity to continue buying and to be honest I felt that before a few years ago when I started trying to consistently buy bitcoin from the price of $30k until bitcoin touched $16k and returned to conditions where $40k at that time.
Worry is there and it is nature but in the end when our goals are set for the long term then I think we will not be too affected by it even though worry remains but our common sense will still run which makes us realize that excessive worry will only make us panic and disrupt our goals. I went through that and now I am still trying to make purchases even though rationally if it is a temporary profit to be obtained I have actually gotten it from previous purchases but when the commitment to invest for the next few years is at least 2 halving cycles (for me) then I will still survive with all the obvious risks that must be faced.